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Current and efficiency optimization under oscillating forces in entropic barriers |
| Ferhat Nutku, Ekrem Aydiner |
| Theoretical Physics Research Group, Department of Physics, Faculty of Science, İstanbul University, Vezneciler, İstanbul 34134, Turkey |
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Abstract The transport of externally overdriven particles confined in entropic barriers is investigated under various types of oscillating and temporal forces. Temperature, load, and amplitude dependence of the particle current and energy conversion efficiency are investigated in three dimensions. For oscillating forces, the optimized temperature-load, amplitude-temperature, and amplitude-load intervals are determined when fixing the amplitude, load, and temperature, respectively. By using three-dimensional plots rather than two-dimensional ones, it is clearly shown that oscillating forces provide more efficiency compared with a temporal one in specified optimized parameter regions. Furthermore, the dependency of efficiency to the angle between the unbiased driving force and a constant force is investigated and an asymmetric angular dependence is found for all types of forces. Finally, it is shown that oscillating forces with a high amplitude and under a moderate load lead to higher efficiencies than a temporal force at both low and high temperatures for the entire range of contact angle.
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Received: 17 February 2016
Revised: 07 May 2016
Accepted manuscript online:
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PACS:
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05.40.Jc
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(Brownian motion)
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05.10.Gg
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(Stochastic analysis methods)
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05.40.-a
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(Fluctuation phenomena, random processes, noise, and Brownian motion)
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| Fund: Project supported by the Istanbul University, Turkey (Grant No. 55383). |
Corresponding Authors:
Ferhat Nutku
E-mail: fnutku@istanbul.edu.tr
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Cite this article:
Ferhat Nutku, Ekrem Aydiner Current and efficiency optimization under oscillating forces in entropic barriers 2016 Chin. Phys. B 25 090501
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